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TDA7512 数据表(PDF) 7 Page - STMicroelectronics |
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TDA7512 数据表(HTML) 7 Page - STMicroelectronics |
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7 / 42 page ![]() 7/42 TDA7512 V60 Lower threshold start with KAGC KAGC = max, V7-9 = 0mVRMS, ∆fIF=300KHz 98 dB µV V35 Startpoint KAGC KAGC = max, V7-9 = 0mVRMS, ∆fIF=300KHz fIF1 generate FSW level at V35 3.6 V ∆ Control range KAGC ∆V35= +0.4V 16 dB RIN Input resistance 10 k Ω CIN Input capacitance 2.5 pF AGC Time Constant Output V10 Max. AGC output voltage V7-9 = 0mVRMS VREF1 +VBE V V10 Min. AGC output voltage V7-9 = 50mVRMS 0.5 V I10 Min. AGC charge current V7-9 = 0mVRMS,V10 = 2.5V -12.5 µA I10 Max. AGC discharge current V7-9 = 50mVRMS,V10 = 2.5V 1.25 mA AGC PIN Diode Driver Output I6 AGC OUT, current min. V7-9 = 0mVRMS, V6 = 2.5V 50 µA I6 AGC OUT, current max. V7-9 = 50 mVRMS, V6 = 2.5V -20 mA I/Q Mixer1 (10.7MHz) RIN Input resistance differential 10 k Ω CIN Input capacitance differential 4 pF ROUT Output resistance differential 100 k Ω V7,9 Input dc bias 3.2 V gm Conversion transconductance 17 mS F Noise figure 400 Ω generator resistance 3dB CP1dB 1dB compression point referred to diff. mixer input 100 dB µV IIP3 3rd order intermodulation 122 dB µV IQG I/Q gain adjust G -1 +1 % IQP I/Q phase adjust PH -7 +8 DEG IRR Image rejection ratio ratio wanted/image 30 40 dB IRR Image rejection ratio with gain and phase adjust 40 46 dB Table 3. ELECTRICAL CHARACTERISTICS (continued) Tamb = +25°C, VCC1 = VCC2 = VCC3 = VCCVCO = VCCMIX1 = VCCIF1=8.5V, fRF = 98MHz, dev. = 40kHz, fMOD =1kHz, fIF1 =10.7MHz, fIF2 =450KHz, fXtal = 10.25MHz, in application circuit, unless otherwise specified. Symbol Parameter Test Condition Min. Typ. Max. Unit |
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